1 files changed, 131 insertions, 0 deletions
diff --git a/nuttx/sched/env_findvar.c b/nuttx/sched/env_findvar.c
new file mode 100644
index 000000000..a8e94180c
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+++ b/nuttx/sched/env_findvar.c
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+/****************************************************************************
+ * sched/env_findvar.c
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifndef CONFIG_DISABLE_ENVIRON
+
+#include <stdbool.h>
+#include <string.h>
+#include <sched.h>
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: env_cmpname
+ ****************************************************************************/
+
+static bool env_cmpname(const char *pszname, const char *peqname)
+{
+  /* Search until we find anything different in the two names */
+
+  for (; *pszname == *peqname; pszname++, peqname++);
+
+  /* On sucess, pszname will end with '\0' and peqname with '=' */
+
+  if ( *pszname == '\0' && *peqname == '=' )
+    {
+      return true;
+    }
+
+  return false;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: env_findvar
+ *
+ * Description:
+ *   Search the provided environment structure for the variable of the
+ *   specified name.
+ *
+ * Parameters:
+ *   envp The environment structre to be searched.
+ *   pname The variable name to find
+ *
+ * Return Value:
+ *   A pointer to the name=value string in the environment
+ *
+ * Assumptions:
+ *   - Not called from an interrupt handler
+ *   - Pre-emptions is disabled by caller
+ *
+ ****************************************************************************/
+
+FAR char *env_findvar(environ_t *envp, const char *pname)
+{
+  char *ret = NULL;
+
+  /* Verify input parameters */
+
+  if (envp && pname)
+    {
+      char *ptr;
+      char *end = &envp->ev_env[envp->ev_alloc];
+
+      /* Search for a name=value string with matching name */
+
+      for (ptr = envp->ev_env;
+           ptr < end && !env_cmpname( pname, ptr);
+           ptr += (strlen(ptr) + 1));
+
+      /* Check for success */
+
+      if (ptr < end)
+        {
+          ret = ptr;
+        }
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_DISABLE_ENVIRON */
+
+
+